Cancelled subscription

I called early august to request cancellation just after I have the aid end of July for the month of august since it’s prepaid you pay in advance, I was advised that’s late debit will end of August I didn’t understand why but I thought oh well you know, they then fetched their router and the sim was deactivated end of august but they still debited on the 25th of September. I tried calling them and their number rings to voicemail, there’s no email address on their website to log queries. I want my money back and please cancel all debit